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Heat Transfer

Calculate the energy transferred from the potatoes during this process (from initial time to the time when its surface temperature drops to 110°C) in J. Q =

 

i need only the second part's answer time=466s

Small potato balls of 0.5 cm radius (can be approximated as a sphere) baked in the oven and initially at a uniform temperature of 180°C. Assume, potatoes have a density of 650 kg/m3, specific heat of 3100 J/kgK and conductivity of 1 W/mK. You are hungry and want to cool them down to be able to eat them without burning your tongue. Air h, To hot potato initially @ T; How long it will take (in seconds) for its surface temperature to drop 110 °C if potatoes are exposed to air at 40°C with a convective heat transfer coefficient of 5 W/m2K? time = 466 s Calculate the energy transferred from the potatoes during this process (from initial time to the time when its surface temperature drops to 110°C) in J. Q = ( 63.6 J x 402 s 429 s 507 s 532 s 553 s 605 s 59.2 J 67.4 J 70.8 J| 73.8 J| 76.5 J| 81.2 J
Transcribed Image Text:Small potato balls of 0.5 cm radius (can be approximated as a sphere) baked in the oven and initially at a uniform temperature of 180°C. Assume, potatoes have a density of 650 kg/m3, specific heat of 3100 J/kgK and conductivity of 1 W/mK. You are hungry and want to cool them down to be able to eat them without burning your tongue. Air h, To hot potato initially @ T; How long it will take (in seconds) for its surface temperature to drop 110 °C if potatoes are exposed to air at 40°C with a convective heat transfer coefficient of 5 W/m2K? time = 466 s Calculate the energy transferred from the potatoes during this process (from initial time to the time when its surface temperature drops to 110°C) in J. Q = ( 63.6 J x 402 s 429 s 507 s 532 s 553 s 605 s 59.2 J 67.4 J 70.8 J| 73.8 J| 76.5 J| 81.2 J
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